Rubbing-machine engine.



J. J. DIGKSON. RUBBING MACHINE ENGINE. APPLICATION FILED MAY 17 1911.

1,017,389, Patented Feb. 13,1912.

2 SHEETS-SHEET 1.

WITNESSES: 1 ZNVENTOR: v A $4M A TTORNEY.

COLUMBIA PLANOGRAPH 60.,WAsnlNuToN, n. c.

J. J. DIGKSON.

RUBBING MACHINE ENGINE.

APPLICATION FILED MAY1'7, 1911.

Patented F91). 13, 1912.

2 SHEETS-SHEET z.

1N VEN TOR:

ATTORNEY.

WITNESSES:

JEREMIAH J. DICKSON, OF INDIANAPOLIS, INDIANA.

RUBBING-MACHINE ENGINE.

Specification of Letters Patent.

Application filed May 17, 1911.

Patented Feb. 13, 1912.

Serial No. 627,822.

To all whom it may concern:

Be it known that I, JEREMIAH J. DICKSON, a citizen of the United States, residing at Indianapolis, inthe county of Marion and State of Indiana, have invented a new and useful Rubbing-Machine Engine, of which the following is a specification, reference being had to the accompanying drawings and to the letters and figures of reference marked thereon.

This invention relates to a portable engine of the type that is adapted to be operated by fluid pressure, especially compressed air and to be carried about by hand, the invention having reference more particularly to an engine that is especially adapted to operate a rubbing machine suitably constructed to be carried by hand and to clean faces of walls of buildings.

The object of the invention primarily is to provide a simple and compact engine adapted to be operated by compressed air for operating rubbing machines or the like and which will be adapted to be constructed as part of the rubbing machine, so that the whole may be easily and conveniently carried about and held up to the work by the operator, more especially in cases where the air compressing plant could not conveniently be moved about from place to place; a still further object being to provide a reliable small portable engine of the above mentioned character that shall be so constructed as to be durable and economical in use, and especially adapted to operate a rubbing machine substantially as described in my application for Letters Patent, filed March 23, 1911, Serial No. 616,471, the improved engine being illustrated in said patent application in connection with the rubbing machine and engine proper forming the subject matter of the claims in said application.

With the above mentioned and minor objects in view the present invention consists in a single cylinder reciprocating engine provided with novel valve gear and operating mechanism therefor, and also an improved means for carrying the engine; and the invention consists further in the novel parts and in the combinations and arrangements of parts as hereinafter particularly described and claimed.

Referring to the drawings, Figure 1 is an elevation of the improved rubbing machine in which portions are in section; Fig. 2, an

inverted plan in which portions are in section; Fig. 3, a fragmentary section on the line A A in Fig. 1; Fig. 4, a fragmentary sectional elevation; Fig. 5, a fragmentary section on the line B B in Fig. 4; Fig. 6, a fragmentary section on the line C C in Fig. 3; Fig. 7 a fragmentary section on the line D D in Fig. 4; Fig. 8, a transverse section on the line E E in Fig. 1; Fig. 9, a fragmentary section on the line F F in Fig. 1; Fig. 10, a fragmentary section on the line G G in Fig. 6; Fig. 11, an inverted plan View of the air controlling valve; and Fig. 12, a fragmentary view showing the plan of the valve seat and ar rangement of ports therein.

Similar reference characters in the different figures of the drawings indicate corresponding elements or features of construction herein referred to.

In order to clearly illustrate and set forth the function of the improved engine abrief description of the rubbing machine with which the engine is more especially adapted to be used is given herein.

The invention as reduced to practice comprlses a hollow cylinder 1 provided at one end thereof with a handle 2 which projects laterally from the cylinder and extends downwardly therefrom when the machine is used on the face of a vertical wall. The cylinder has two ears 3 and 3 on opposite sides of the wall thereof to which rods 4 and 1 are secured, respectively, a head-bar 5 comprising a part of the frame being secured to the rods. Two frame bars 6 and 6 are secured at one end to opposite ends of the frame-bar 5 and are adapted to con stitute parallel guide-bars, the inner sides thereof preferably having guide grooves 7 and 7 therein, respectively. A tail-bar 8 is securedto the opposite ends of the framebars 6 and 6 and it has an open handle 9 on the outer side thereof, the handles 2 and 9 being adapted to be grasped by the workman for carrying and guiding the machine. A rubbing head 10 is provided which is adapted to be guided I'novably between the frame-bars 6 and 6, preferably being fitted into the guide-grooves 7* and 7 so as to slide therein toward and from the head-bar 5 and the tail-bar 8. The rubbing-head has a boss 11 on one side thereof at the end which is nearest to the head-bar, and it is provided preferably with a set-screw 12, the same end of the rubbing head having a jaw 13 fixed on the opposite side thereof. The opposite end. portion of the rubbing head has two slots 14 and 14 therein extending longitudinally, and an adjustable jaw 15 is arranged on the rubbing head opposite the jaw 13 and it has a base flange 16 for its support, the base flange being connected to the rubbing head by means of two,, cap screws 17 and 17 extending through the slots and screwed into the base flange, the heads of the cap screws being in contact with the opposite side of the rubbing head. Any suitable instrument, such as a block of emery or corundum, or a block of wood covered with sand paper, or a steel brush or the like, may be secured between the jaws 13 and 15; in the present case a steel brush 18 being illustrated, and it is securely held not only by the jaws but also by means of bolts 19 and 19 extending through the back of the brush and the two jaws, so that the brush is firmly clamped in its place against the rubbing head.

The cylinder is provided with a head 20 on its end that is nearest to the frame-bar 5 and it has a recess 21 in the inner side thereof, the outer side being provided with a suitable packingnut 22 through which a piston-rod 23 extends, a suitable piston 24 being fitted into the cylinder and secured to the inner end of the piston-rod, the outer end of the piston-rod being secured to the boss 11 by means of the set-screw 12. A coil-spring 25 is seated in the recess 21 and extends inward beyond the inner side of the cylinder head, the spring encircling the piston-rod and adapted to gradually stop the piston 24 and prevent it from striking the cylinder head. The opposite or outer end of the cylinder is provided with a head 26 which has a cylindrical extension 27 011 its outer side normally closed by a plug 28, and a. coilspring 29 is seated against the plug in the extension and projects beyond the inner side of the cylinder head for stopping the piston 24 without A flat valve-seat 30 is cast on the exterior of the wall of the cylinder 1, and a port 31 extends from the valve-seatthrough the wall of the cylinder and affords communication with the outer end of the cylinder, another port 32 extending from the valve-seat to the opposite end portion of the cylinder. A suitable valve chest 33 is secured to the marginal portion of the valveseat and is preferably cylindrical. A suitable disk-shaped valve 34 is provided which has two inlet ports 35 and 36 therein. The under side of the valve has an exhaust cavity 37 adapted to provide communication between the port 31 and an exhaust port 38 which extends from the valve seat through the wall of the cylinder to the atmosphere, 01' to establish communication between the port 32 and the exhaust port. The valve has a central aperture 39 at the sides of which are recesses 40 and 40, and a shaft 41 is rotatably mounted in the front of the valve-chest and extends through the aperture 39 into a guide-socket 42 in the valveseat, and shaft having a key 43 therein which extends into the recesses 40 and 40 for rotating the valve. The shaft has a collar 44 thereon which forms an air-tight joint against the inner side of the front of the valve-chest and is normally held to its seat by means of a plate-spring 45 having two ends supported upon the valve and its middle portion in contact with the collar, the shaft extending through the middle portion of the spring. An inlet pipe 46 is connected to the valve-chest and has a flexible air-pipe or hose 47 connected thereto for supplying compressed air to the valvechest. The top of the valve 34 is provided with projections 48, 48, at opposite sides of the spring 45 adapted to move the spring wit-h the valve. A hub 49 is secured to the outer end of the shaft 41 and has two arms 50 and 51 thereon, and the rotative movement of' the shaft 41 preferably is limited by means of stops 52 and 53 upon the top of the valve-chest and in the path of movement of the arms, in order to stop the valve at the proper positions to open the ports in the valve-seat. The arm 50 is provided with a boss 54 which has a pivot 55 thereon rotatively mounted in the arm, and a valverod 56 is suitably mounted in the boss so as to slide longitudinally therein, the valve-rod having an arm 57 thereon which extends loosely through a suitable opening in the piston-rod 23, being rotatable therein, and is held in the piston-rod by retaining pins 58 and 58 or otherwise as may be preferred. The valve-rod has a collar 59 thereon at one side of the boss 54 and another collar 60 at the opposite side of the boss, the collars being suitably spaced apart and secured to the rod preferably by means of setscrews 61 and 61, respectively, and preferably two coil-springs 62 and 62 are placed 011 the rod at opposite sides of the boss to prevent arring in operation. The arm 51 is provided with a boss (53 which has a pivot 64 rotatively mounted in the arm. A guide rod 65 is suitably secured to the boss and extends through a rotatable guiding abutment 66 which is mounted against the exterior of the cylinder on a suitable .pivotal stud 67 secured to the wall of the cylinder, and a coil-spring 68 is placed on the rod under compression in contact with the abutment and the boss 63, so as to hold the arm 51 against the stop 53 or to force the arm 50 against the stop 52.

It should be understood that the details of construction of the air operated engine may be variously modified as may be desired, and also various other modifications may be made within the scope of the ap pended claims.

1n practical use compressed air is ad mitted to the valve-chest and the workman holds the machine in front of him against the wall that is to be cleaned or smoothed, with a proper instrument held in the jaws 13 and 15 pressed by hand against the object to be worked on, the engine operating automatically to move the rubbing head to and fro. If the work is horizontal or at any other angle, it will be understood that the workman will carry the machine and hold it to the desired place.

In the operation of the engine the valve rod 56 moves the arm 50 by means of the collars 59 and 60 until the pivot 64 crosses the plane in which the shaft 41- and abutment 66 are located, and then the spring 68 acts to move the shaft rotatively the required distance to open the port necessary to produce reverse motion of the piston 24.

Other results will be readily understood from the description and functions of the details of construction of the engine.

Having thus described the invention, what is claimed as new, is

1. An engine including a cylinder having a valve-chest thereon and ports extending from the ends of the cylinder to the valvechest, heads on the cylinder, two rods secured to opposite sides of the cylinder and extending to a plane beyond one end of the cylinder, a frame member connected to the rods, a piston movable in the cylinder, a piston-rod connected to the piston and extending through one of the heads, and a ,yalve movable in the valve-chest for opening or closing the ports.

2. An engine including a cylinder having a valve-chest thereon and ports extending from the ends of the cylinder to the valvechest, heads on the cylinder, two rods se cured to opposite sides of the cylinder and extending to a plane beyond one end of the cylinder, a frame member connected transversely to the rods, a piston movable in the cylinder, a piston-rod connected to the piston and extending through one of the heads, a valve rotatable in the valve-chest and provided with an operating arm and also an accelerating arm, a valve-rod operatively connected with the operating arm and also with the piston-rod, and a spring interposed substantially between the accelerating arm and the cylinder.

3. An engine including a cylinder having a valve-chest thereon and ports extending from the ends of the cylinder to the valvechest, the cylinder having two cars on opposite sides thereof, two rods secured to the two ears respectively and extending to a plane beyond one end of the cylinder, heads on the cylinder, a frame member secured to the rods, a piston movable in the cylinder, a piston-rod secured to the piston and extending through one of the heads and beyond the frame member, a valve rotatable in the valve-chestand provided with an operating arm, and a valve-rod operatively connected with the arm and also with the piston-rod beyond the frame member.

4. In an engine, the combination with a cylinder having two ports extending from the ends thereof, of a valve-seat formed on the cylinder and into which the ports extend, the valve-seat having a central gulde socket therein, an exhaust port extending from the valve-seat, a valve-chest secured to' the cylinder and covering the valve-seat, a valve movable rotatably on the valve-seat in the valve-chest and having two inlet ports therein and also a curved exhaust cavity, a shaft rotative in the valve-chest and keyed to the valve, the shaft extending through the valve and into the guide socket and having a collar thereon seated rotatably against the inner side of the valve-chest opposite the valve, a spring seated on the valve and against the collar, and an operating arm secured to the shaft.

5. In an engine, the combination with a cylinder, heads on the cylinder, a piston movable in the cylinder, at piston-rod secured to the piston and extending through one of the heads, a valve-chest on the cylinder, and ports extending from the valvechest to the ends of the cylinder, of a valve rotative in the valve-chest to open or close the ports, a shaft connected to the valve and rotatable in the valve-chest, an arm secured to the shaft, a boss rotatably mounted on the arm, a valve rod slidingly mounted in the boss and having an arm thereon operatively connected with the piston-rod, two collars secured to the valve-rod at opposite sides of the boss, and two springs on the valve-rod at opposite sides of the boss between the boss and the collars.

6. In a rubbing machine engine, the combination of a cylinder having two ports extending from-the ends thereof, a valve-seat formed on one end portion of the cylinder and into which the ports extend, the cylinder wall having an exhaust port therein extending from the valve seat, a valve-chest secured to the cylinder and covering the valve-seat, a valve movable rotatably on the valve-seat in the valve-chest and having two inlet ports therein and also a curved exhaust cavity, a shaft rotative in the valvechest and fixedly connected to the valve, a hub secured to the shaft and having an operating arm and an accelerating arm thereon, a boss rotatably mounted on the operating arm, a valve-rod slidingly mounted in the boss and having two collars secured thereto at opposite sides of the boss at a distance therefrom, heads on the cylinder, a piston movable in the cylinder, a pistonrod secured to the piston and extending through one of the heads, means connecting the valve-rod With the piston-rod a guide valve-chest for limiting the movement of rotatably mounted on the opposite end porthe arms. 10 tion of the cylinder from the Valve-seat, a In testimony whereof, I afiiX my signature guide rod pivotally connected to the accelin presence of two Witnesses.

erat-ing arm and movable longitudinally in JEREMIAH J. DICKSON. the guide, a coil spring on the guide rod lVitnesses:

and seated substantially against the acceler- E. T. SILVIUS,

ating arm and the guide and stops on the J. H. GARDNER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

